Thomson Covert Elite Dropper Seatpost. Features: Covert model is designed for frames with internal routing options for a cleaner look A true Thomson product. Quality and dependability are just the beginning Nitrogen charged hydraulic height adjustable seatpost that features Norglide bushings and Trelleburg o-rings 12-sided star shaped lower section prevents any side-to-side play or rotation 100mm, 125mm, or 150mm range of travel that locks anywhere in its vertical range. An internal second check value keeps the post from being pulled back up when it is dropped Sealed hydraulic cartridge is activated via a mechanical cable, no bleeding required 41mm rail clamping area. Micro adjust, dual pivoting bolt head with 5mm clamp offset Includes small ergonomic remote handlebar release lever with automotive grade cable and housings Specs: Model:Covert Travel Drop:100mm Diameter:30.9mm Length:375mm Color:black